/* --- comienzo de los estilos de la estructura ---*/
header, nav, section, article, footer {
  display: block;
}
html, body{
	height: 100%;
}
body { 
    font-family: Arial,Helvetica,sans-serif;
    font-size: 12px;
	margin : 0 auto;
	padding : 0;
	position: relative;
	width: 1100px;
}
body .contenedor-general {
    margin: 0 auto;
    position: relative;
}
footer {
    clear: both;
    padding: 10px;
}
 /* -- fin de los estilos de la estructura -- */

/*  GRID OF TWELVE   ============================================================================= */

.span_12_of_12 {
	width: 100%;
}

.span_11_of_12 {
	width: 91.53%;
}

.span_10_of_12 {
	width: 83.06%;
}

.span_9_of_12 {
	width: 74.6%;
}

.span_8_of_12 {
	width: 66.13%;
}

.span_7_of_12 {
	width: 57.66%; 
}

.span_6_of_12 {
	width: 49.2%; 
}

.span_5_of_12 {
	width: 40.73%; 
}

.span_4_of_12 {
	width: 32.26%; 
}

.span_3_of_12 {
	width: 23.8%;
}

.span_2_of_12 {
	width: 15.33%; 
}

.span_1_of_12 {
	width: 6.86%; 
}


/*  GO FULL WIDTH AT LESS THAN 480 PIXELS */

@media only screen and (max-width: 480px) {
	.span_12_of_12 {
		width: 100%; 
	}
	.span_11_of_12 {
		width: 100%; 
	}
	.span_10_of_12 {
		width: 100%; 
	}
	.span_9_of_12 {
		width: 100%; 
	}
	.span_8_of_12 {
		width: 100%; 
	}
	.span_7_of_12 {
		width: 100%; 
	}
	.span_6_of_12 {
		width: 100%; 
	}
	.span_5_of_12 {
		width: 100%; 
	}
	.span_4_of_12 {
		width: 100%; 
	}
	.span_3_of_12 {
		width: 100%; 
	}
	.span_2_of_12 {
		width: 100%; 
	}
	.span_1_of_12 {
		width: 100%; 
	}
}